COMMISSION 27 OF THE I. A. U.
		INFORMATION BULLETIN ON VARIABLE STARS
                            Number 2334

							Konkoly Observatory
							Budapest
							13 May 1983

							HU ISSN 0374-0676

                    NEW ECLIPSING SUPERGIANT 22 Vul





  An eclipse of 22 Vul (HD 192713, V = 5.15), spectral type G3 Ib-II, was
observed on 17 April 1983 during IUE observations from 18h to 21h UT. The
companion B9 spectrum discovered previously by us with IUE was absent, and
the FES magnitude (effective wavelength ~5200 A) was 0.12 +- 0.02 mag fainter
than on several dates in 1982. The star is a single-lined spectroscopic
binary with period 249.1 days (revised by Parsons 1983, Ap. J. Suppl., in
press), eccentricity 0.02, and a_1 sin i = 93 x 10^6 km. From the radial
velocity curve, times of mid-eclipse of the B secondary by the G primary
may be expected at approximately

2,445,442.2 + 249.099 E.

The duration of eclipse is unknown, but totality lasts at least 8 days since
observations on 21 April again did not show the B spectrum. From the
expected radius ~40 R_Sun of the primary and estimated mass ratio ~0.7, totality
may be estimated at 10 days for i = 90d. Eclipse depths will be greater at
shorter wavelengths.




SIDNEY B. PARSONS

Laboratory for Astronomy and Solar Physics
Goddard Space Flight Center, Code 685
Greenbelt, MD 20771, U.S.A


THOMAS B. AKE

Computer Sciences Corporation
Goddard Space Flight Center, Code 685.9
Greenbelt, MD 20771, U.S.A